Abstract: A method is disclosed for producing photocatalytic coated ceramic granules. The method involves providing a coatable composition containing an inorganic binder and a variety of photocatalytic particles, such as TiO2, ZnO, Ti(OH)4, doped derivatives, or combinations thereof. These photocatalytic particles have a surface area per weight of no more than 15 m2/g. The coatable composition is then applied to uncoated base ceramic granules, resulting in intermediate coated granules. Finally, the intermediate coated granules are heated at a temperature of at least 700° C., leading to the formation of photocatalytic coated ceramic granules. These granules exhibit a Total Solar Reflectance (TSR) value of at least 0.7. This method offers an efficient and effective way to produce ceramic granules with enhanced photocatalytic properties.

Abstract: Well bores employed for production of hydrocarbons having open hole completion and zonal breakdown in the locus of the well bore are recompleted, advantageously for injection of a fluid such as CO.sub.2 in an enhanced oil recovery process. Recompletion is effected by packing off the open hole interval, emplacing a particulate material in the packed off interval and broken down zone, adhering the particulates together with an adhesive to form a permeable synthetic rock-like material, reaming out the open hole interval to a greater diameter than the original completion, setting a casing over the open hole interval, cementing between the casing and the reamed out hole, and perforating at the zones to be isolated and to be communicated with from the well bore, e.g., for CO.sub.2 injection.